/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TO_STRING_ARRAY_H_included
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#define TO_STRING_ARRAY_H_included
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#include <stddef.h>
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#include <jni.h>
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#include "module_api.h"
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// Public API for libnativehelper library.
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MODULE_API jobjectArray newStringArray(JNIEnv* env, size_t count);
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MODULE_API jobjectArray toStringArray(JNIEnv* env, const char* const* strings);
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#ifdef __cplusplus
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#include <string>
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#include <vector>
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#include "ScopedLocalRef.h"
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template <typename Counter, typename Getter>
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jobjectArray toStringArray(JNIEnv* env, Counter* counter, Getter* getter) {
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size_t count = (*counter)();
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jobjectArray result = newStringArray(env, count);
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if (result == NULL) {
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return NULL;
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}
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for (size_t i = 0; i < count; ++i) {
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ScopedLocalRef<jstring> s(env, env->NewStringUTF((*getter)(i)));
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if (env->ExceptionCheck()) {
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return NULL;
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}
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env->SetObjectArrayElement(result, i, s.get());
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if (env->ExceptionCheck()) {
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return NULL;
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}
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}
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return result;
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}
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struct VectorCounter {
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const std::vector<std::string>& strings;
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explicit VectorCounter(const std::vector<std::string>& strings) : strings(strings) {}
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size_t operator()() {
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return strings.size();
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}
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};
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struct VectorGetter {
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const std::vector<std::string>& strings;
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explicit VectorGetter(const std::vector<std::string>& strings) : strings(strings) {}
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const char* operator()(size_t i) {
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return strings[i].c_str();
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}
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};
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inline jobjectArray toStringArray(JNIEnv* env, const std::vector<std::string>& strings) {
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VectorCounter counter(strings);
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VectorGetter getter(strings);
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return toStringArray<VectorCounter, VectorGetter>(env, &counter, &getter);
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}
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#endif // __cplusplus
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#endif // TO_STRING_ARRAY_H_included
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